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69 lines
1.5 KiB
69 lines
1.5 KiB
6 years ago
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package trace
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import (
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"context"
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"encoding/binary"
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"math/rand"
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"time"
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"github.com/bilibili/Kratos/pkg/conf/env"
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"github.com/bilibili/Kratos/pkg/net/ip"
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"github.com/bilibili/Kratos/pkg/net/metadata"
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"github.com/pkg/errors"
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)
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var _hostHash byte
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func init() {
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rand.Seed(time.Now().UnixNano())
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_hostHash = byte(oneAtTimeHash(env.Hostname))
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}
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func extendTag() (tags []Tag) {
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tags = append(tags,
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TagString("region", env.Region),
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TagString("zone", env.Zone),
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TagString("hostname", env.Hostname),
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TagString("ip", ip.InternalIP()),
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)
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return
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}
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func genID() uint64 {
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var b [8]byte
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// i think this code will not survive to 2106-02-07
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binary.BigEndian.PutUint32(b[4:], uint32(time.Now().Unix())>>8)
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b[4] = _hostHash
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binary.BigEndian.PutUint32(b[:4], uint32(rand.Int31()))
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return binary.BigEndian.Uint64(b[:])
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}
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type stackTracer interface {
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StackTrace() errors.StackTrace
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}
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type ctxKey string
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var _ctxkey ctxKey = "Kratos/pkg/net/trace.trace"
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// FromContext returns the trace bound to the context, if any.
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func FromContext(ctx context.Context) (t Trace, ok bool) {
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if v := metadata.Value(ctx, metadata.Trace); v != nil {
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t, ok = v.(Trace)
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return
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}
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t, ok = ctx.Value(_ctxkey).(Trace)
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return
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}
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// NewContext new a trace context.
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// NOTE: This method is not thread safe.
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func NewContext(ctx context.Context, t Trace) context.Context {
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if md, ok := metadata.FromContext(ctx); ok {
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md[metadata.Trace] = t
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return ctx
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}
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return context.WithValue(ctx, _ctxkey, t)
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}
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